Highly sensitive long period grating based tunable filter using a unique double-cladding layer structure

Shizhuo Yin, Kun Wook Chung, Xin Zhu

    Research output: Contribution to journalArticle

    64 Citations (Scopus)

    Abstract

    In this paper, we present a highly sensitive long period grating (LPG) with a unique double-cladding layer structure including an ultra-thin inner silica cladding layer and a low refractive index liquid crystal outer cladding layer. By using an ultra-thin cladding layer (28 μm in diameter) reduced by chemical etching, the LPG has a single resonant band over a wide range of wavelength and higher sensitivity to the environmental refractive index change. In addition, the high thermal-optic effect of liquid crystal makes it very easy to tune the resonant wavelength by controlling the temperature of the liquid crystal. Thus, a highly sensitive tunable filter can be made. The experimental results show that a tuning efficiency of 2.1 nm/°C is achieved. To the best of our knowledge, this is the highest tuning efficiency ever reported.

    Original languageEnglish (US)
    Pages (from-to)301-305
    Number of pages5
    JournalOptics Communications
    Volume188
    Issue number5-6
    DOIs
    StatePublished - Feb 15 2001

    Fingerprint

    tunable filters
    Liquid Crystals
    gratings
    Liquid crystals
    liquid crystals
    Refractive index
    Tuning
    tuning
    refractivity
    Wavelength
    wavelengths
    Silicon Dioxide
    Etching
    Optics
    Silica
    etching
    optics
    silicon dioxide
    sensitivity
    Temperature

    All Science Journal Classification (ASJC) codes

    • Electronic, Optical and Magnetic Materials
    • Atomic and Molecular Physics, and Optics
    • Physical and Theoretical Chemistry
    • Electrical and Electronic Engineering

    Cite this

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    abstract = "In this paper, we present a highly sensitive long period grating (LPG) with a unique double-cladding layer structure including an ultra-thin inner silica cladding layer and a low refractive index liquid crystal outer cladding layer. By using an ultra-thin cladding layer (28 μm in diameter) reduced by chemical etching, the LPG has a single resonant band over a wide range of wavelength and higher sensitivity to the environmental refractive index change. In addition, the high thermal-optic effect of liquid crystal makes it very easy to tune the resonant wavelength by controlling the temperature of the liquid crystal. Thus, a highly sensitive tunable filter can be made. The experimental results show that a tuning efficiency of 2.1 nm/°C is achieved. To the best of our knowledge, this is the highest tuning efficiency ever reported.",
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    Highly sensitive long period grating based tunable filter using a unique double-cladding layer structure. / Yin, Shizhuo; Chung, Kun Wook; Zhu, Xin.

    In: Optics Communications, Vol. 188, No. 5-6, 15.02.2001, p. 301-305.

    Research output: Contribution to journalArticle

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